Dicopper hydroxide phosphate

Exposure related observations in humans: other data

Administrative data

Endpoint:

exposure-related observations in humans: other data

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference

Reference Type:

publication

Title:

Copper concentration in tap water and possible effects on infant’s health – Results of a study in Lower Saxony, Germany

Author:

B. P. Zietz, J. Dassel de Vergara and H. Dunkelberg

Year:

2003

Bibliographic source:

Environmental Research 92 (2003) 129-138

Materials and methods

Type of study / information:

Epidemiological study

Endpoint addressed:

repeated dose toxicity: oral

Test guideline

Qualifier:

no guideline followed

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

Cu 1+ and Cu 2+ salts

Molecular formula:

Cu

IUPAC Name:

Cu 1+ and Cu 2+ salts

Specific details on test material used for the study:

Cu2+ as copper in drinking water

Method

Ethical approval:

confirmed, but no further information available

Details on study design:

This epidemiological study examines the exposure of infants to increased copper concentrations through drinking water from public water supplies in southern Lower Saxony, Germany, and whether this dietary copper intake causes liver damage in early childhood.

Exposure assessment:

measured

Details on exposure:

TYPE OF EXPOSURE: orally via drinking water

Results and discussion

Results:

None of the examined infants showed any signs of liver malfunction. From the results of the study, no indication of a hazard due to copper pipes connected to public water supplies could be found.

Applicant's summary and conclusion

Executive summary:

Copper in drinking water has been associated with non-Indian childhood cirrhosis (NICC), a form of liver cirrhosis in childhood. This epidemiological study examines the exposure of infants to increased copper concentration through drinking water from public water supplies in southern Lower, Saxony, Germany, and whether this dietary copper intake causes liver damage in early childhood. In total, water samples from 1674 households with infants were tested for copper. The mean copper concentration was 0.81 mg/l in the 1619 collected stagnation samples and 0.11 mg/l in the 1660 random daytime samples. There were notable regional differences in copper values. In 10.3% of all sampled households a copper value of 0.5 mg/l or more was found. These families were requested top additionally collect 2 composite samples. An increased level of copper in the drinking water with copper concentrations at or above 0.8 mg/l in the composite samples and a defined minimum ingestion of tap water was followed by a recommendation of a paediatric examination. Fourteen infants were examined by a paediatrician and of these 11 received a blood serum analysis. None of the examined infants showed any signs of liver malfunction. From the results of the study, no indication of a hazard due to copper pipes connected to public water supplies could be found.